75 Cet

Planetary system · 270.6 light-years away · also HD 15779, HIP 11791

75 Cet is 271 light-years from the Sun. The NASA Exoplanet Archive lists 2 planets around this G3 III star; the first was found in 2012 by radial velocity (Okayama Astrophysical Observatory).

Fly there in 3D

Worth knowing

75 Cet c takes 5.6 years to go round its star once.

75 Cet is one of 2 stars in its system. The position of the other star is not catalogued, so only 75 Cet and its planets are drawn.

The star

Spectral typeG3 III
Surface temperature4,809 K
Mass1.92 solar masses
Radius10.38 solar radii
Luminosity51.82 times the Sun
Apparent magnitude5.3532
Distance from the Sun270.6 light-years (83.0 parsecs)
Position (J2000)RA 38.0392°, Dec -1.0350°
ConstellationCetus

Planets (2)

PlanetYearOrbitRadiusMassFound
75 Cet b696.6 days1.912 AU13.3 R⊕ estimated787.9 M⊕ minimumRadial Velocity, 2012
75 Cet c5.6 years3.929 AU13.9 R⊕ estimated289.86 M⊕ minimumRadial Velocity, 2023

Values are the NASA Exoplanet Archive’s composite parameters. A radius marked estimated comes from a mass–radius relation; a mass marked minimum is M sin i. Planet sizes and colours in the 3D view are renderings: none of these worlds has been photographed as more than a point of light.

The planets, compared

For a star of 4,809 K, 52 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 7.20 to 13.14 AU. None of its known planets orbits inside it. The zone says how much starlight arrives, not whether a planet has water or air. The edges follow Kopparapu et al. (2014), as the 3D view draws them.

The light you see left 271 years ago, around 1760.

Nearest systems to it

Also found by Okayama Astrophysical Observatory

Sources

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